Modulation Approaches
- Direct Sequence
- Simultaneous use of multiple frequencies
- Signal spread many times
- Very efficient (no overhead)
- Typical raw data rate 2Mb/s
- 802.11 standard
- Frequency Hopping
- Sequential use of multiple frequencies
- Hop sequence and rate will vary
- “End hop waste time”
- Typical raw data rate 1.4 Mb/s